If you've used Office 365 before, you'll remember the admin portal for the unified communications service formerly known as Lync was distinctly minimal, with very few settings you could change. As Skype for Business gains more features, there are correspondingly more options and controls, but it's a far cry from the complexity of the on-premise version; this is one of the services where being in the cloud makes unified communications dramatically simpler.
Now that Skype for Business can connect to Skype, you can control that integration, as well as allowing or blocking calls and chats with Skype for Business users outside your company, and choosing whether the Skype Broadcast service is available for creating large public online meetings. Again, the controls for external connections are duplicated in the main Office 365 admin portal – for many businesses, they're the only settings you might want to change, so you might never need the full admin centre.
You can also set the defaults for notifications and privacy mode and add your own boilerplate to meeting invitations. You can include your company logo, links to support, any legal terms and conditions that apply to meetings, or a few lines of text you wish to be included in all invitations.
You can use Skype for Business for dial-in conferencing, with or without toll-free numbers, so your users can phone in rather than using the Skype for Business client – that's included in the E5 Office 365 plan, or you can buy it as an add-on. You can also use PSTN Calling to call standard phone numbers and receive calls from anyone, not just other Skype for Business users (again, that's included in some plans but not in others – confusingly, there's a version of the E5 plan that has it, and another that doesn't).
You can even use Skype for Business as your PBX – as well as making and receiving calls, you get PBX features like transferring calls, having several phones ring when a call arrives, putting your phone on 'do not disturb' except for a few key contacts, playing hold music and handling voicemail. Again, you need the right licences.
The admin centre also includes a handy list of tools for troubleshooting, and a very minimal set of reports.
Lync Online was already an impressive HD videoconferencing system with excellent tools for online meetings. The Skype integration makes it a great choice for letting your customers and partners reach you without the cost of a phone call, and if you add the dial-in conferencing, PSTN calling and PBX tools, it's close to being a cloud service that offers a full unified communications system. But buying all those options as separate add-ons, some from third-party communications providers, does make everything more complicated than we'd like.